In the world of dysfunctional families, the Fischers aren’t so bad. In “If I Forget,” for all their differences, they come together after the death of their mother to celebrate their father’s birthday, and to deal with the issues of an aging parent. Hmmm, their aging father is 75.

Steven Levenson, author of “Dear Evan Hansen,” has crafted characters about whom we care. His writing is wonderful, prolific and pitch-perfect. The story of the Fischers kept us in our seats and interested even though a half hour might have been cut from this 2-hour, 40-minute play. Steven Suskin’s review in the Huffington Post hits the nail on the head.

Looking at Levinson’s biography makes clear the infrastructure that has grown up to support young, talented playwrights — a tribute to generous and strategic philanthropy. “His work has been seen and developed by Roundabout, Lincoln Center Theater, Manhattan Theatre Club, Atlantic Theater Company, MCC Theater, Ars Nova, Ensemble Studio Theatre, Berkshire Theatre Festival, and Oregon Shakespeare Festival. A graduate of Brown University and the 2010 Artist in Residence at Ars Nova, Mr. Levenson is currently working on new play commissions for Roundabout, Lincoln Center, and Ars Nova. He is a member of the MCC Playwrights’ Coalition.”

“If I Forget” provides another evening well spent at the Roundabout. It is scheduled to run until April 30th.